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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2186a3a417ef33c6a928fafc26718d45af539d551e1ea67ac7b710bbf1cd98f' 
  AND token = '5sDXulGbReGG1ZK9vYnBg+0Us6Oxbu0kwpXuHcy6gCM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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