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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ecdd3e5d9023d162de3833281d6183c42c164d6250add061e0ace418853a40b2' 
  AND token = '/urOjFJ/SCpXrL8qvnjWiMWdSs2bOfBaj/Qf3rrZ6w8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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