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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2562686632017c981bf725f451b59181aa41eb3fb9951818e5e2b92ad6aa991d' 
  AND token = '3oU6M2BDhUHeYG7rrySPG8sYHlKis1CGkNWZeU0r9sY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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