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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a7721812f5fbf06a818cd2ba51ac44a71586f39cb710fcf7a5e70aa3483484a' 
  AND token = 'mkp70dA+ZxWPN9Ql3hBRHXp+DP1X9UxuJdB4UxQa5AI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00137

JSON explain

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