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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa6ea4765d8efb6d107c1efadcfafff7bc3e8158c00d6e8f504a6ebdae9aa8be' 
  AND token = 'mOg/wYq4WiE2ZUl6zoqgBVFRxnLrTpbRxwMENTHSyL0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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