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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '117947124a4343d71d66306a33b8f0e2e9e560979b92063370fbbb57aad696cb' 
  AND token = '7QhO06IpnXD3ALi57E0RZEWgMSFqN5VikfOH74Wqhwc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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