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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9fd561e900c04e10a0a71dfabde7b09d6212159306c62ba4e8e2c10db8f5721f' 
  AND token = 'HAt/EKxTj18YVmdjzxzz90+Q0iGEYeeXiSIDTE/BIvY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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