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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23ea32b85c1caeebb77c8b80632d69ae747002769b933aa3f96add725cd7c0d0' 
  AND token = 'oSS2gT87t0Cz0drE1T4O+c1WjWFpeSyi6Zge+BV9YLg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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