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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5eeaa90e9b81ccce0b8901158cfb86633cede183e35cb04861ba0d470ab5302' 
  AND token = 'bPv8Qd8SN8eAqvWmfjyUrgLTXRJoWSC5vkpFczk7HHM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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