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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6108ce8d95f3b24ce7a3d6fe7c0bd94ce0042851dfe964eb577866bcafdfa384' 
  AND token = '41yv2c2OFH2GI8Um7rNFQ73FFhqpgVruKMSza7ueNhE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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