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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7494c592cbe5694819913ed8d58439fa7767d33eeab8943efdcb97917cda4a3' 
  AND token = 'F2Q7QoCWQMCF6OB2sl8wvGoJszC5h8+P7V/9cedkpwU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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