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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30a490864cca95062ca3bd7add62b50faa7fcc3d61fc5e5e682118e2f89234b6' 
  AND token = '/oRCpi/7iooBx/uZcUbbPmn1VYcUfmhR6k+n6gShoMg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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