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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0058ac2d05f1729dd14b89ec2235205b030611ae7f5002ca852b4b5b64487dbb' 
  AND token = '8ShAg/XxsFdtJuNWVg58tubUQNRXxSeevMTtWEc+vpw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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