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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4fcf6f30a0172274cdd2142b4a7abfcfbe2f15e8edc1f8dcaa009a4b112bcc02' 
  AND token = 'aMIJhrONPqlgasiw3GtG7H3azfBICjESGgBa6J3pZaU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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