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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8ff7057ec04f8e9561644564a45bf2f1d10ef2c026716220ef654cf3b4792c5' 
  AND token = 'nHXRX0y6Pyc6q3JBRoQzcMd8dFJN2nxVX1WagS7Q0Kk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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