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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50e35f9faecaf61b8b4ed2f6d91e6e76a785c96e19fd8ba82aba027e8e497608' 
  AND token = 'z1qVmEDF1CCWHwO34hKECQqQO28B1u6RbGXG5+tq6+Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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