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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e00bcafc779d50cfc98c44ee8758099ff5a6de789870056ea2b0501c8ad2930' 
  AND token = 'RbkMj2zRr52g3CYTdVWbUW7uQJnsAvAIyDis5tiFx44=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}