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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9c1a7a654e5ddfbba2502911c7f899b79332034d9611922fd60ceaa33dfc308' 
  AND token = '+9l1qAhVBTlJkb6M1AC4bWdNxSazX68KzbiS/nAD97M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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