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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a120f9b2b65b92beac5ad28763df9ce9e5a9e3533c861d0ff56fe2e4cf839a7' 
  AND token = 'GGKS3HM3A0KzuEOWvHyA7h0xLfXD9Lm8zBlMWsppN/8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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