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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '888ea7d30275e7d6fd57b74c7cb225352d6a564b107f0d395602cf0364408a5b' 
  AND token = 'SfHeN/VQpMVAXf4XA1Z5Tpx368BBdrvC8qf6J/OeDTQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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