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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8df2e1e2e5dde170e12a548186ce9be52dd26a38ce30d4bf09390b066f2d3fce' 
  AND token = 'UB4xyG33DdEaiHDN5iVUKBrU3W2chbBEwd2z5gj01ww=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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