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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12ad42cde5966f646aa96c6ab92da8164a87dcc6d43b94d9471b5ed08b24e9ac' 
  AND token = 'gOIQ5D/XIVa95IzA44KZLTMqfOzyUprsnPorldUPsh8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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