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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d8c31decbf50ab51651010faf0f22607de14f926c70cca62b53af8966053d70' 
  AND token = 'F3RIkaU+qT93JJgnsjwfk8OFQUsMuZ1L0njIh+C9/yc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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