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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0b61bd2eb199dd4189a0d96bcab53b1d86ddf6d8bbbb63a0b88f5e2b0d6bffa' 
  AND token = 'EmY3C/mjTbIzP7wLHwgZhmDat1IclEIdzkxkguM38YI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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