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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aec77b3ac2585be122f761ea1db3ea8699e62d0a572903a70b37e42bb24b7230' 
  AND token = 'DarDEKw2kTDLw29eROn3YmL1zwd3ATSV5J/09jbplr8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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