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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '058b99afa3a360cd054d8e91994590a491f9e0404e83ab1e0fd85193a2f0beb8' 
  AND token = 'w7SQlC8aXKTKeESo2kSQiaU8WAIcAJMtELgBmZItvDs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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