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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ba83358377a9750e65d75c68fab73a68934fb0db1d1262fc4b3c91472db3f9e' 
  AND token = 'itE09vDg3HpEAoGXQ0xaGfnuvoNOBfFSS82HcussFts=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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