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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20f0637531f9ada868c8d86320f34c00afd1d1c96ae3e6af1511ad2be93fa8c3' 
  AND token = 'XSq6u/nm3NbpzMC3crkGdr8HwbZbI5sbp6bDZC935HE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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