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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '628b120fa51bb8db4b9571417ddce7a5169d23ffbdb8222fd424c4fdfd06eff4' 
  AND token = '2KAqspafGp/50XXlfREu6CBqhnLxIazi2l7zahEeOzo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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