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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9fde998ce0baae7457a026aeb1971a5f96e0fc5950f95b0197709c54f27b5f6d' 
  AND token = 'sGLIIIMGOE/+pCItY6hljR9A6Lb8pAciQRsDIQAfuSs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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