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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '025c8d1bfebdbb2a1b1b6c3edf66258c2982615c1ba39584da1931540be0e490' 
  AND token = 'v9u+1xbHNVrmeCewhj5zXQ+Q+GBVROxzH6MSKxDie/E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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