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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8daa9c18c861c5dc2ce227dbd9117353b92ea4eb78fd0fc81eea6bcd0de29bc7' 
  AND token = '/uQh9vvG+pZZIShaehw807zbYGKjf08pVyU9t+71SLM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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