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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32ca871de3478eb063a5b5e50932677e5c1e98aa598de896c9b3f52e7d661591' 
  AND token = 'yUhgBqYx6d+P4nAOYPQL65MsWFTXcy2CjdT8kIw9DAs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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