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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93ef19b37293bfa8116428fc218049c1d4e82d5c2dcf6cb7393b7d0211629626' 
  AND token = '+irbm8S+bE7dTcZtemU1SRffwEF4HxQ+Qy1iBzMJuCI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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