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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b436032f366edfd101733a28a9c47139cbb83c9a04a538573f96c966f13f971' 
  AND token = 'vxgEOIDTX9F0Z+irJpANN5tf8P1tJa2Rim6AGI/qIfo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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