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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f304462789df64acba742b68f2c4f678429f066ee2e2b77286ea765018977705' 
  AND token = 'R8m3/2EQGYgJvApTf1AbVQTGCt9cUt1p6dwZOlru6/c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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