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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a3684f2aab6e8e96b127b1af12a8166bbf1a4e403482984e5ba7f5258f3173e' 
  AND token = '3KjEdxzMXH8/lC4SZycAVmvHjVmWLdRRwL3kDyA8mY8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00153

JSON explain

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