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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '492c55c94f1adf62b09bf22d120c0f14ca14cdb7759ac6df8f5444aa29e3ace8' 
  AND token = 'tyeRcEDRiI0rm6Lu2u6zS0Vlt90tmt/7xRsbVvypgdE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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