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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ddd7d21298aaa3618750fdfaa63c68bbc535d37594eef5a8c6ea35118a17e49d' 
  AND token = 'Vni7MQ5Lt7/fwSk/I1O8CuEDTliQ1U1e2qmcDym1noE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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