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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a0db2d7c06f28e5580f99f11b797406f5f7fe0dd34ebb253dbac8c3171f471e' 
  AND token = '9TOb1wEgBR/1YOWd9UbD2EdClZUG8zlTwwHi89NAgoY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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