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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fded3e0d16b3eb517a368efa34c110eb1b0a73cc41ee6bc14f7b1aae6e3be718' 
  AND token = '0mvO18SwXZp+GK82ZQs1Jon/IDGKAJgmSlyf5QqP5ww=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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