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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f39ec81b53521e41dc2b2ef36ec27d4d9f06c75c293cc86aca7ee887c0ac5bf' 
  AND token = '8VWO/thlzSu560E5ersDk1iszsLn6UqBDBvwtTVGans=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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