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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebada39c3d033a5b0c5d62d7605a420b0a6ee4aa5a939ff3adb997b0a87f63eb' 
  AND token = 'd9yiq+FGAl8TMSIFFwMc9KPYptY5rHiplEC02B9B1nY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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