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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ffc29c213a9d13cc2cf0626ef16327c40eb60cdae40303d73a8bb1bb0ed3a846' 
  AND token = 'jT21giIqZmvsV8L84aAydFw5NUyz901HXBA4vpXh/Cw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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