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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a925b5a5edb58d46a6ae168560d5ce3d17d4a0b31abd1e2d7e18f2ddf745b4a' 
  AND token = 'XmHU8UKSEAB6gNJRsz7aSccUHgR9XMr+mc8lMUkMEd0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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