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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3acfac76b419bb98ce736b94aa23e02b1223c1e60b69aec9de4aee99fbb304ae' 
  AND token = 'WyXhiH8LqbBDSFnQDXJXLq+JS6RBsq7PjWavYpIeT2Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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