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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17d29c97fd7fffcc898d35ca0df7db23047f5594369bc8a158fdd6350de0b3df' 
  AND token = '5CMspRDZht0BNFaHa0fH1af/Ki/zKOA/Ab4A+BXuYDw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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