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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '059dfb514f4bf0a22812ead289804d04a9dacb735b2c4fc18a9e806ccad5eb1d' 
  AND token = '3ncOXZXFiWK2evRt1f25WPkxlH6xALTn+JIVtyFFHxg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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