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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9d014bd620dff8fa93de612aacf2f245380b105e81042e8f4e3688f68b4928c' 
  AND token = 'fUpL3IoG2Idrgsdg5TODHLtyUOmD8dkdy7yiOQd22ew=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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