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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '430a68c247883e509bb218d5ad8458737d56eb9da76fc21f19b2746def24deab' 
  AND token = 'Hx+gvp38A6wCKE0DhNCe4rN3RSg6dy87DILe076PJeg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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