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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd76958ff45d11708e469402113b5d7465aa376ac6b80b696266b0210181fd167' 
  AND token = 'motLWE27RARQu9/Vch2hHGp3tflg4juUQgsQE6Sz46I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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