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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '798ddbf077ece3cb722291e295fbcf8dc22953cec4b2e2bae04e5ccf54d4ab82' 
  AND token = 'T+qHQ7yIlpQInAThhmPg8n3/2Fa9vRWjnoDsH6k2fsw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00146

JSON explain

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