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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc3b7eca4dbd7e2ec0728ed385603fc38add95bcb9a5e85b6046f2c050ff9a15' 
  AND token = 'pI1UCES1mgLHqg/V/1oc0tVFD1NmgdWHkgZ/zYoyw8c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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