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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e156c30ed2d70410ebc2919d623baa1d1ac2b2c388a56a2c295ffd5417845b3e' 
  AND token = '48PHii6RaNcQ85w8DcSehyVrbp63i8rMDpHr3x0CF+M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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