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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75db64acc9a3f1f2dc6507712d5d323360c1c3c2d1df12be5a0f1f44a3585aa9' 
  AND token = 'kC7E2TLeF4RiCSj4hctuzwJ0m3Jlg0gHPWjQq1I+fqk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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