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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95729605bd199bc4edcde9d4e45a971900385b956d8e9dad5fc51c1c5830f9be' 
  AND token = '41wFAFalMHcLlLCPohR5atxoXFU/GDkE6roqGfBJchA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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