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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fcbf8b8d261fa5707fd086c1ee0f5da8dade5132e89374f6c6deeb00ff123507' 
  AND token = '/aTHu7+4NQVs9rIkd00KF95INer46KqZdbTgfDJpYxk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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