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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4fb95a2134f3c5e2ab33234ce4d10ab2ad115af31ae1d2281168d3863a28d675' 
  AND token = 'WhkGffIY38mQ3ctetRd/EQ22qpakdbbDKRuliOaJDzk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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