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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6893805e2b00bf3e1f3ef6f50c38575f57baa3d976b4ff3c61570f00e2ed2fa1' 
  AND token = '6T9EQTdPGZ3Cc44eLw/uKsZfS9iUvxTbsZarvv8Xs7w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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