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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '959b00621269e729c8371b3ddfe533f47ff62cd85b0b35638cff00e53a430f96' 
  AND token = '5sCfH6e/A80BYN5e85zAjQGhxlC6wqtsvw1o5pWLyhc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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