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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91a0065c4e171af2c8f81addc881d09e099fa7de297e9417f5235e6c7185ad24' 
  AND token = 'jJiGx9Po9Dozff2nPFf6uym5C3J0i8qtaWSqYzJGbT0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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