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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '299a8cfaad0b83455cc4619582446883f68b4e489735f03053d30918280a2e3c' 
  AND token = '7wXoXWPqj5+XHqBouE/OAXD1eR0EzO8ppYDnm6H+8/I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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