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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '307ab427cf72cdc1500c0f750b11b345b40d0811d4afd999edcf3273edb7eae8' 
  AND token = '8jBmrlsrCT/T/L8XAQyGUPwrulRJ3jr8ZjY2AEJ3rvE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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