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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b738968dc612834fe9d8cda7dba7c810016453b4f6160efa3851c98038f77cb' 
  AND token = 'B/Raa3Q1wg9YViZ4c/BhEKvdCosHdte1MKl3T9h5e4k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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