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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c90612ba46d0aa32adafff92a72712675ddb479af178023a31276fcb118ab3a8' 
  AND token = 'SVBKcYKbID7lk3qmSK+KbxKKu7/VY612HzS0VvHk3OM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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