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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93c3eafa91d58ee551aac92f52ac34751f5e5143fe7e65b708307fca6a74c73c' 
  AND token = 'WRNpFbSpwWcmFXyAdmMA1LMXp8JFkmBDzgQR8epRyw0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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