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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9e907ee1651c2aed31328880f8bcdbf14fb1db537db8a18aaab470bd2a2175e' 
  AND token = 'A6Z8KezkjnZfvG7Qlh2XesZ1SFmX92a0rzhnjpYi938=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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