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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ae5156da35fc444a9715b95c477e97961c04bc1b0d31d8784c8f05bb3c115bf' 
  AND token = 'KLaQ8SKxhV94l/RYphptaq/qv0OuugD5ywT9N8gg0Uo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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